add additional info in backport process
add additional info in backport process

add information in backporting process related to cherry-picking
main PR and related fixes

Signed-off-by: Akhil Mohan <4cae9921969941028df9cda9f628ce61d68ee0cd@vmware.com>

containerd/containerd,containerd/containerd,estesp/containerd,thaJeztah/containerd,mikebrow/containerd,mikebrow/containerd,thaJeztah/containerd,estesp/containerd